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3.0.5-SNAPSHOT
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< span id = "groovy" > < / span > < h1 > groovy< a class = "headerlink" href = "#groovy" title = "永久链接至标题" > ¶< / a > < / h1 >
< blockquote >
< div > Arthas 支持 groovy 脚本增强，允许像 BTrace 一样编写脚本来解决问题，可以在 groovy 脚本中进行if/for/switch/while 等控制语句，不受限制，但相比 BTrace 而言拥有更多的限制范围。< / div > < / blockquote >
< div class = "section" id = "" >
< span id = "id1" > < / span > < h2 > 限制内容< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< ol class = "simple" >
< li > 禁止改变原有逻辑，与 watch 等命令一样，重点保证的是监听和观察。< / li >
< li > 只允许在方法的 before/success/exception/finish 四个环节进行监听。< / li >
< / ol >
< / div >
< div class = "section" id = "" >
< span id = "id2" > < / span > < h2 > 参数说明< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< table border = "1" class = "docutils" >
< thead >
< tr >
< th align = "right" > 参数名称< / th >
< th align = "left" > 参数说明< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td align = "right" > < em > class-pattern< / em > < / td >
< td align = "left" > 类名表达式匹配< / td >
< / tr >
< tr >
< td align = "right" > < em > method-pattern< / em > < / td >
< td align = "left" > 方法名表达式匹配< / td >
< / tr >
< tr >
< td align = "right" > < em > script-filepath< / em > < / td >
< td align = "left" > groovy 脚本的绝对路径< / td >
< / tr >
< tr >
< td align = "right" > [S]< / td >
< td align = "left" > 匹配所有的子类< / td >
< / tr >
< tr >
< td align = "right" > [E]< / td >
< td align = "left" > 开启正则表达式匹配，默认为通配符匹配< / td >
< / tr >
< / tbody >
< / table > < ul class = "simple" >
< li > 需要说明的是，第三个输入参数是脚本的绝对路径，比如 < code class = "docutils literal notranslate" > < span class = "pre" > /tmp/test.js< / span > < / code > ，不建议输入相对路径，比如 < code class = "docutils literal notranslate" > < span class = "pre" > ./test.js< / span > < / code > < / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id3" > < / span > < h2 > 五个关键函数声明< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "highlight-java notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "cm" > /**< / span >
< span class = "cm" > * 增强脚本监听器< / span >
< span class = "cm" > */< / span >
< span class = "kd" > interface< / span > < span class = "nc" > ScriptListener< / span > < span class = "o" > {< / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * 脚本创建< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * @param output 输出器< / span >
< span class = "cm" > */< / span >
< span class = "kt" > void< / span > < span class = "nf" > create< / span > < span class = "o" > (< / span > < span class = "n" > Output< / span > < span class = "n" > output< / span > < span class = "o" > );< / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * 脚本销毁< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * @param output 输出器< / span >
< span class = "cm" > */< / span >
< span class = "kt" > void< / span > < span class = "nf" > destroy< / span > < span class = "o" > (< / span > < span class = "n" > Output< / span > < span class = "n" > output< / span > < span class = "o" > );< / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * 方法执行前< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * @param output 输出器< / span >
< span class = "cm" > * @param advice 通知点< / span >
< span class = "cm" > */< / span >
< span class = "kt" > void< / span > < span class = "nf" > before< / span > < span class = "o" > (< / span > < span class = "n" > Output< / span > < span class = "n" > output< / span > < span class = "o" > ,< / span > < span class = "n" > Advice< / span > < span class = "n" > advice< / span > < span class = "o" > );< / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * 方法正常返回< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * @param output 输出器< / span >
< span class = "cm" > * @param advice 通知点< / span >
< span class = "cm" > */< / span >
< span class = "kt" > void< / span > < span class = "nf" > afterReturning< / span > < span class = "o" > (< / span > < span class = "n" > Output< / span > < span class = "n" > output< / span > < span class = "o" > ,< / span > < span class = "n" > Advice< / span > < span class = "n" > advice< / span > < span class = "o" > );< / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * 方法异常返回< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * @param output 输出器< / span >
< span class = "cm" > * @param advice 通知点< / span >
< span class = "cm" > */< / span >
< span class = "kt" > void< / span > < span class = "nf" > afterThrowing< / span > < span class = "o" > (< / span > < span class = "n" > Output< / span > < span class = "n" > output< / span > < span class = "o" > ,< / span > < span class = "n" > Advice< / span > < span class = "n" > advice< / span > < span class = "o" > );< / span >
< span class = "o" > }< / span >
< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "advice" >
< span id = "advice" > < / span > < h2 > 参数 < code class = "docutils literal notranslate" > < span class = "pre" > Advice< / span > < / code > 说明< a class = "headerlink" href = "#advice" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > < code class = "docutils literal notranslate" > < span class = "pre" > Advice< / span > < / code > 参数最主要是封装了通知节点的所有信息。参考< a class = "reference internal" href = "advice-class.html" > < span class = "doc" > 表达式核心变量< / span > < / a > 中关于该节点的描述。< / p >
< / div >
< div class = "section" id = "output" >
< span id = "output" > < / span > < h2 > 参数 < code class = "docutils literal notranslate" > < span class = "pre" > Output< / span > < / code > 说明< a class = "headerlink" href = "#output" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > < code class = "docutils literal notranslate" > < span class = "pre" > Output< / span > < / code > 参数只拥有三个方法，主要的工作还是输出对应的文本信息< / p >
< div class = "highlight-java notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "cm" > /**< / span >
< span class = "cm" > * 输出器< / span >
< span class = "cm" > */< / span >
< span class = "kd" > interface< / span > < span class = "nc" > Output< / span > < span class = "o" > {< / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * 输出字符串(不换行)< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * @param string 待输出字符串< / span >
< span class = "cm" > * @return this< / span >
< span class = "cm" > */< / span >
< span class = "n" > Output< / span > < span class = "nf" > print< / span > < span class = "o" > (< / span > < span class = "n" > String< / span > < span class = "n" > string< / span > < span class = "o" > );< / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * 输出字符串(换行)< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * @param string 待输出字符串< / span >
< span class = "cm" > * @return this< / span >
< span class = "cm" > */< / span >
< span class = "n" > Output< / span > < span class = "nf" > println< / span > < span class = "o" > (< / span > < span class = "n" > String< / span > < span class = "n" > string< / span > < span class = "o" > );< / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * 结束当前脚本< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * @return this< / span >
< span class = "cm" > */< / span >
< span class = "n" > Output< / span > < span class = "nf" > finish< / span > < span class = "o" > ();< / span >
< span class = "o" > }< / span >
< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "groovy" >
< span id = "id4" > < / span > < h2 > 一个输出日志的 groovy 脚本示例< a class = "headerlink" href = "#groovy" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "highlight-groovy notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "kn" > import< / span > < span class = "nn" > com.taobao.arthas.core.command.ScriptSupportCommand< / span >
< span class = "kn" > import< / span > < span class = "nn" > com.taobao.arthas.core.util.Advice< / span >
< span class = "kn" > import< / span > < span class = "nn" > static< / span > < span class = "n" > java< / span > < span class = "o" > .< / span > < span class = "na" > lang< / span > < span class = "o" > .< / span > < span class = "na" > String< / span > < span class = "o" > .< / span > < span class = "na" > format< / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * 输出方法日志< / span >
< span class = "cm" > */< / span >
< span class = "kd" > public< / span > < span class = "kd" > class< / span > < span class = "nc" > Logger< / span > < span class = "kd" > implements< / span > < span class = "n" > ScriptSupportCommand< / span > < span class = "o" > .< / span > < span class = "na" > ScriptListener< / span > < span class = "o" > {< / span >
< span class = "nd" > @Override< / span >
< span class = "kt" > void< / span > < span class = "nf" > create< / span > < span class = "o" > (< / span > < span class = "n" > ScriptSupportCommand< / span > < span class = "o" > .< / span > < span class = "na" > Output< / span > < span class = "n" > output< / span > < span class = "o" > )< / span > < span class = "o" > {< / span >
< span class = "n" > output< / span > < span class = "o" > .< / span > < span class = "na" > println< / span > < span class = "o" > (< / span > < span class = "s2" > " script create." < / span > < span class = "o" > );< / span >
< span class = "o" > }< / span >
< span class = "nd" > @Override< / span >
< span class = "kt" > void< / span > < span class = "nf" > destroy< / span > < span class = "o" > (< / span > < span class = "n" > ScriptSupportCommand< / span > < span class = "o" > .< / span > < span class = "na" > Output< / span > < span class = "n" > output< / span > < span class = "o" > )< / span > < span class = "o" > {< / span >
< span class = "n" > output< / span > < span class = "o" > .< / span > < span class = "na" > println< / span > < span class = "o" > (< / span > < span class = "s2" > " script destroy." < / span > < span class = "o" > );< / span >
< span class = "o" > }< / span >
< span class = "nd" > @Override< / span >
< span class = "kt" > void< / span > < span class = "nf" > before< / span > < span class = "o" > (< / span > < span class = "n" > ScriptSupportCommand< / span > < span class = "o" > .< / span > < span class = "na" > Output< / span > < span class = "n" > output< / span > < span class = "o" > ,< / span > < span class = "n" > Advice< / span > < span class = "n" > advice< / span > < span class = "o" > )< / span > < span class = "o" > {< / span >
< span class = "n" > output< / span > < span class = "o" > .< / span > < span class = "na" > println< / span > < span class = "o" > (< / span > < span class = "n" > format< / span > < span class = "o" > (< / span > < span class = "s2" > " before:class=%s;method=%s;paramslen=%d;%s;" < / span > < span class = "o" > ,< / span >
< span class = "n" > advice< / span > < span class = "o" > .< / span > < span class = "na" > getClazz< / span > < span class = "o" > ().< / span > < span class = "na" > getSimpleName< / span > < span class = "o" > (),< / span >
< span class = "n" > advice< / span > < span class = "o" > .< / span > < span class = "na" > getMethod< / span > < span class = "o" > ().< / span > < span class = "na" > getName< / span > < span class = "o" > (),< / span >
< span class = "n" > advice< / span > < span class = "o" > .< / span > < span class = "na" > getParams< / span > < span class = "o" > ().< / span > < span class = "na" > length< / span > < span class = "o" > ,< / span > < span class = "n" > advice< / span > < span class = "o" > .< / span > < span class = "na" > getParams< / span > < span class = "o" > ()))< / span >
< span class = "o" > }< / span >
< span class = "nd" > @Override< / span >
< span class = "kt" > void< / span > < span class = "nf" > afterReturning< / span > < span class = "o" > (< / span > < span class = "n" > ScriptSupportCommand< / span > < span class = "o" > .< / span > < span class = "na" > Output< / span > < span class = "n" > output< / span > < span class = "o" > ,< / span > < span class = "n" > Advice< / span > < span class = "n" > advice< / span > < span class = "o" > )< / span > < span class = "o" > {< / span >
< span class = "n" > output< / span > < span class = "o" > .< / span > < span class = "na" > println< / span > < span class = "o" > (< / span > < span class = "n" > format< / span > < span class = "o" > (< / span > < span class = "s2" > " returning:class=%s;method=%s;" < / span > < span class = "o" > ,< / span >
< span class = "n" > advice< / span > < span class = "o" > .< / span > < span class = "na" > getClazz< / span > < span class = "o" > ().< / span > < span class = "na" > getSimpleName< / span > < span class = "o" > (),< / span >
< span class = "n" > advice< / span > < span class = "o" > .< / span > < span class = "na" > getMethod< / span > < span class = "o" > ().< / span > < span class = "na" > getName< / span > < span class = "o" > ()))< / span >
< span class = "o" > }< / span >
< span class = "nd" > @Override< / span >
< span class = "kt" > void< / span > < span class = "nf" > afterThrowing< / span > < span class = "o" > (< / span > < span class = "n" > ScriptSupportCommand< / span > < span class = "o" > .< / span > < span class = "na" > Output< / span > < span class = "n" > output< / span > < span class = "o" > ,< / span > < span class = "n" > Advice< / span > < span class = "n" > advice< / span > < span class = "o" > )< / span > < span class = "o" > {< / span >
< span class = "n" > output< / span > < span class = "o" > .< / span > < span class = "na" > println< / span > < span class = "o" > (< / span > < span class = "n" > format< / span > < span class = "o" > (< / span > < span class = "s2" > " throwing:class=%s;method=%s;" < / span > < span class = "o" > ,< / span >
< span class = "n" > advice< / span > < span class = "o" > .< / span > < span class = "na" > getClazz< / span > < span class = "o" > ().< / span > < span class = "na" > getSimpleName< / span > < span class = "o" > (),< / span >
< span class = "n" > advice< / span > < span class = "o" > .< / span > < span class = "na" > getMethod< / span > < span class = "o" > ().< / span > < span class = "na" > getName< / span > < span class = "o" > ()))< / span >
< span class = "o" > }< / span >
< span class = "o" > }< / span >
< / pre > < / div >
< / div >
< p > 使用示例：< / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > $ groovy com.alibaba.sample.petstore.dal.dao.ProductDao getProductById /Users/zhuyong/middleware/arthas/scripts/Logger.groovy -S
script create.
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 102 ms.
before:class=IbatisProductDao;method=getProductById;paramslen=1;[Ljava.lang.Object;@45df64fc;
returning:class=IbatisProductDao;method=getProductById;
before:class=IbatisProductDao;method=getProductById;paramslen=1;[Ljava.lang.Object;@5b0e2d00;
returning:class=IbatisProductDao;method=getProductById;
< / pre > < / div >
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< footer >
< hr / >
< div role = "contentinfo" >
< p >
© Copyright 2018, Alibaba Middleware Group, and contributors.
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Built with < a href = "http://sphinx-doc.org/" > Sphinx< / a > using a < a href = "https://github.com/rtfd/sphinx_rtd_theme" > theme< / a > provided by < a href = "https://readthedocs.org" > Read the Docs< / a > .
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